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031bd879f7
linux/arch/arm
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Lorenzo Pieralisi 031bd879f7 ARM: mm: implement LoUIS API for cache maintenance ops 
ARM v7 architecture introduced the concept of cache levels and related
control registers. New processors like A7 and A15 embed an L2 unified cache
controller that becomes part of the cache level hierarchy. Some operations in
the kernel like cpu_suspend and __cpu_disable do not require a flush of the
entire cache hierarchy to DRAM but just the cache levels belonging to the
Level of Unification Inner Shareable (LoUIS), which in most of ARM v7 systems
correspond to L1.

The current cache flushing API used in cpu_suspend and __cpu_disable,
flush_cache_all(), ends up flushing the whole cache hierarchy since for
v7 it cleans and invalidates all cache levels up to Level of Coherency
(LoC) which cripples system performance when used in hot paths like hotplug
and cpuidle.

Therefore a new kernel cache maintenance API must be added to cope with
latest ARM system requirements.

This patch adds flush_cache_louis() to the ARM kernel cache maintenance API.

This function cleans and invalidates all data cache levels up to the
Level of Unification Inner Shareable (LoUIS) and invalidates the instruction
cache for processors that support it (> v7).

This patch also creates an alias of the cache LoUIS function to flush_kern_all
for all processor versions prior to v7, so that the current cache flushing
behaviour is unchanged for those processors.

v7 cache maintenance code implements a cache LoUIS function that cleans and
invalidates the D-cache up to LoUIS and invalidates the I-cache, according
to the new API.

Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
2012-09-25 11:20:25 +01:00
..
boot Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm 2012-09-13 09:05:22 +08:00
common ARM: dma-mapping: add support for dma_get_sgtable() 2012-07-30 12:25:47 +02:00
configs Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into fixes 2012-09-04 21:41:35 -07:00
include/asm ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
kernel ARM: 7526/1: traps: send SIGILL if get_user fails on undef handling path 2012-09-07 20:40:44 +01:00
lib ARM: 7529/1: delay: set loops_per_jiffy when moving to timer-based loop 2012-09-09 17:28:48 +01:00
mach-at91 ARM: at91/clock: fix PLLA overclock warning 2012-08-23 15:00:09 +02:00
mach-bcmring
mach-clps711x ARM: clps711x: Remove the setting of the time 2012-07-17 22:24:30 +02:00
mach-cns3xxx ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
mach-davinci ARM: davinci: remove broken ntosd2_init_i2c 2012-08-10 13:14:36 +02:00
mach-dove ARM: Orion: Set eth packet size csum offload limit 2012-08-15 13:58:09 +00:00
mach-ebsa110
mach-ep93xx arm-soc: soc-specific updates 2012-07-23 16:08:40 -07:00
mach-exynos Merge branch 'v3.6-samsung-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into fixes 2012-08-23 17:03:49 +02:00
mach-footbridge ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
mach-gemini ARM: gemini: fix the gemini build 2012-09-04 22:17:34 -07:00
mach-h720x
mach-highbank clk: add highbank clock support 2012-07-11 17:58:47 -07:00
mach-imx ARM: clk-imx35: Fix SSI clock registration 2012-09-11 11:52:28 +02:00
mach-integrator ARM: integrator: include <linux/export.h> 2012-08-09 15:16:44 +02:00
mach-iop13xx ARM: PCI: get rid of pci_std_swizzle() 2012-05-13 17:12:16 +01:00
mach-iop32x ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
mach-iop33x ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
mach-ixp4xx - More robust parsing especially of xattr data in JFFS2 2012-06-01 16:55:42 -07:00
mach-kirkwood Merge branch 'fixes-for-3.6' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 2012-09-08 16:22:43 -07:00
mach-ks8695 ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
mach-l7200/include/mach
mach-lpc32xx ARM: LPC32xx: Add PWM clock 2012-07-20 14:01:51 +02:00
mach-mmp ARM: mmp: fix potential NULL dereference 2012-08-10 22:32:24 +08:00
mach-msm ARM: MSM: use SGI0 to wake secondary CPUs 2012-07-09 17:39:36 +01:00
mach-mv78xx0 Merge branch 'fixes-for-v3.6' of git://git.infradead.org/users/jcooper/linux into fixes 2012-08-15 18:18:29 +02:00
mach-mvebu arm: mvebu: generate DTBs for supported SoCs 2012-07-17 22:38:06 +02:00
mach-mxs ARM: mxs: always build ocotp 2012-08-04 22:52:23 +08:00
mach-netx arch/arm/mach-netx/fb.c: reuse dummy clk routines for CONFIG_HAVE_CLK=n 2012-07-30 17:25:13 -07:00
mach-nomadik ARM: nomadik: bump all IRQ numbers by one 2012-06-11 12:40:14 +02:00
mach-omap1 Merge branch 'dmaengine' of git://git.linaro.org/people/rmk/linux-arm 2012-08-01 16:41:07 -07:00
mach-omap2 Some hwmod, clockdomain, am335x fixes against v3.6-rc4. 2012-09-05 10:09:31 -07:00
mach-orion5x ARM: Orion: Set eth packet size csum offload limit 2012-08-15 13:58:09 +00:00
mach-picoxcell clocksource: dw_apb_timer: Add common DTS glue for dw_apb_timer 2012-07-12 17:26:09 +02:00
mach-pnx4008 arm-soc: sweeping late_initcall cleanup 2012-05-26 13:14:01 -07:00
mach-prima2 ARM: PRIMA2: delete redundant codes to restore LATCHED when timer resumes 2012-08-02 10:05:27 -07:00
mach-pxa Input: eeti_ts: pass gpio value instead of IRQ 2012-08-09 15:16:41 +02:00
mach-realview
mach-rpc ARM: fiq: change FIQ_START to a variable 2012-07-01 21:59:19 +08:00
mach-s3c24xx Merge branch 'v3.6-samsung-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into fixes 2012-08-23 17:03:49 +02:00
mach-s3c64xx ARM: arm-soc soc updates, take 2 2012-07-30 09:45:53 -07:00
mach-s3c2410
mach-s3c2412
mach-s3c2440
mach-s5p64x0 arm-soc: device tree description updates 2012-07-23 16:17:43 -07:00
mach-s5pc100 arm-soc: device tree description updates 2012-07-23 16:17:43 -07:00
mach-s5pv210 arm-soc: board specific updates 2012-07-23 17:34:48 -07:00
mach-sa1100 ARM: sa1100: include linux/io.h in hackkit leds code 2012-08-09 15:16:42 +02:00
mach-shark ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
mach-shmobile Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into fixes 2012-09-04 21:41:35 -07:00
mach-socfpga ARM: socfpga: initial support for Altera's SOCFPGA platform 2012-07-19 10:39:00 +02:00
mach-spear3xx Merge branch 'dmaengine' of git://git.linaro.org/people/rmk/linux-arm 2012-08-01 16:41:07 -07:00
mach-spear6xx Merge branch 'dmaengine' of git://git.linaro.org/people/rmk/linux-arm 2012-08-01 16:41:07 -07:00
mach-spear13xx Viresh has moved 2012-06-20 14:39:36 -07:00
mach-tegra ARM: tegra: more regulator fixes for Harmony 2012-08-09 15:16:40 +02:00
mach-u300 ARM: u300: convert to common clock 2012-07-11 15:36:45 -07:00
mach-ux500 Merge branch 'randconfig/mach' into fixes 2012-08-23 17:30:54 +02:00
mach-versatile ARM: fix mach-versatile/pci.c warning 2012-07-04 17:04:57 +01:00
mach-vexpress ARM: vexpress: Config option for early printk console 2012-07-13 11:48:29 +01:00
mach-vt8500 Merge branch 'for-3.6' of git://gitorious.org/linux-pwm/linux-pwm 2012-07-30 09:22:37 -07:00
mach-w90x900
mach-zynq
mm ARM: mm: implement LoUIS API for cache maintenance ops 2012-09-25 11:20:25 +01:00
net ARM: 7421/1: bpf_jit: BPF_S_ANC_ALU_XOR_X support 2012-06-14 15:12:13 +01:00
nwfpe
oprofile ARM: 7448/1: perf: remove arm_perf_pmu_ids global enumeration 2012-07-09 17:41:10 +01:00
plat-iop ARM: PCI: provide a default bus scan implementation 2012-05-13 17:12:17 +01:00
plat-mxc ARM: SoC fixes 2012-08-02 11:48:20 -07:00
plat-nomadik i2c-nomadik: move header to <linux/platform_data/i2c-nomadik.h> 2012-07-09 11:40:40 +02:00
plat-omap Merge branch 'fixes-wakeupgen' into fixes 2012-09-05 10:06:08 -07:00
plat-orion ARM: Orion: Set eth packet size csum offload limit 2012-08-15 13:58:09 +00:00
plat-pxa Merge branch 'for-3.6' of git://gitorious.org/linux-pwm/linux-pwm 2012-07-30 09:22:37 -07:00
plat-s3c24xx ARM: S3C24XX: Fix s3c2410_dma_enqueue parameters 2012-08-08 09:04:51 +09:00
plat-samsung Merge branch 'v3.6-samsung-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into fixes 2012-08-23 17:03:49 +02:00
plat-spear Merge branch 'dmaengine' of git://git.linaro.org/people/rmk/linux-arm 2012-08-01 16:41:07 -07:00
plat-versatile Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-07-27 15:14:26 -07:00
tools
vfp ARM: 7483/1: vfp: only advertise VFPv4 in hwcaps if CONFIG_VFPv3 is enabled 2012-08-11 09:15:57 +01:00
Kconfig Merge branch 'fixes-for-3.6' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 2012-09-08 16:22:43 -07:00
Kconfig-nommu
Kconfig.debug ARM: 7521/1: Fix semihosting Kconfig text 2012-09-07 20:40:44 +01:00
Makefile ARM: 7513/1: Make sure dtc is built before running it 2012-09-07 20:36:44 +01:00